Properties of Kπ=01+ , Kπ=2− , and Kπ=01− bands of Ne20 probed via proton and α inelastic scattering

Abstract

The $K^\pi=0^+_1$, $K^\pi=2^-$, and $K^\pi=0^-_1$ bands of $^{20}$Ne are investigated with microscopic structure and reaction calculations via proton and $\alpha$ inelastic scattering off $^{20}$Ne. Structures of $^{20}$Ne are calculated with variation after parity and total angular momentum projections in the antisymmetrized molecular dynamics(AMD). The $K^\pi=0^+_1$ and $K^\pi=0^-_1$ bands have $^{16}\textrm{O}+\alpha$ cluster structures, whereas the $K^\pi=2^-$ band shows a $^{12}\textrm{C}+2\alpha$-like structure. Microscopic coupled-channel calculations of proton and $\alpha$ scattering off $^{20}$Ne are performed by using the proton-nucleus and $\alpha$-nucleus potentials, which are derived by folding the Melbourne $g$-matrix $NN$ interaction with AMD densities of $^{20}$Ne. The calculation reasonably reproduces the observed cross sections of proton scattering at $E_p=25$--35 MeV and $\alpha$ scattering at $E_\alpha=104$--386 MeV. Transition properties from the ground to excited states are discussed by reaction analyses of proton and $\alpha$ inelastic processes. Mixing of the $K^\pi=2^-$ and $K^\pi=0^-_1$ bands is discussed by detailed analysis of the $0^+_1\to 3^-_1$ and $0^+_1\to 3^-_2$ transitions. For the $3^-_1$ state, mixing of the $K^\pi=0^-_1$ cluster component in the $K^\pi=2^-$ band plays an important role in the transition properties.